You can tweak your render pass nodes, for example, via the value in the node, and visualize the changes interactively through IPR.
The following figure illustrates the IPR results when the Alpha value of the pass is set to 0.2, 1, and 3.
NoteWhen performing IPR, if you have a render target specified, IPR does not re-render the entire image, but only reflects updates
to the way your passes are re-combined (for example, in this case, via the). The
option in the toolbar does not work with IPR. See
Render View toolbar for more information.